vcsh

   1 #!/bin/sh
   2
   3 [ -n "$VCSH_DEBUG" ]      && set -x
   4 [ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
   5 [ -z "$VCSH_BASE" ]       && VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
   6
   7 SELF=$(basename $0)
   8
   9 help() {
  10         echo "usage: $SELF <args>
  11
  12    clone <remote> \\
  13          [<repo>]       Clone from an existing repository
  14    help                 Display this help text
  15    delete               Delete an existing repository
  16    enter                Enter repository; spawn new $SHELL
  17    init <repo>          Initialize a new repository
  18    list                 List all repositories
  19    run <repo> \\
  20        <command>        Use this repository
  21
  22    seed-gitignore \\
  23    <repo>               Seed .gitignore.d/<repo> from git ls-files
  24    setup                Set up repository with recommended settings
  25
  26    <repo> <git command> Special command that allows you to run git commands
  27                         directly without having to type so much ;)" >&2
  28 }
  29
  30 debug() {
  31         [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"
  32 }
  33
  34 verbose() {
  35         if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
  36 }
  37
  38 error () {
  39         echo "$SELF: error: $1" >&2
  40 }
  41
  42 fatal () {
  43         echo "$SELF: fatal error: $1" >&2
  44         exit $2
  45 }
  46
  47 setup() {
  48         git config core.worktree     "$GIT_WORK_TREE"
  49         git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
  50         git config vcsh.vcsh         'true'
  51         touch   "$HOME/.gitignore.d/$VCSH_REPO_NAME"
  52         git add "$HOME/.gitignore.d/$VCSH_REPO_NAME"
  53 }
  54
  55 init() {
  56         verbose "init() begin"
  57         [ ! -e "$GIT_DIR" ] || fatal "$GIT_DIR exists" 10
  58         export GIT_WORK_TREE="$HOME"
  59         mkdir -p "$GIT_WORK_TREE"
  60         cd "$GIT_WORK_TREE" || fatal "could not enter $GIT_WORK_TREE" 11
  61         cd "$GIT_WORK_TREE"
  62         git init
  63         setup
  64         verbose "init() end"
  65 }
  66
  67 use() {
  68         verbose "use() begin"
  69         if [ ! -d "$GIT_DIR" ]; then
  70                 error "no repository found for '$VCSH_REPO_NAME'"
  71                 return 12
  72         fi
  73         export GIT_DIR
  74         export GIT_WORK_TREE="$(git config --get core.worktree)"
  75         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
  76         verbose "use() end"
  77 }
  78
  79
  80 if [ "$1" = 'clone' ]; then
  81         export VCSH_COMMAND="$1"
  82         GIT_REMOTE="$2"
  83         export GIT_REMOTE
  84         VCSH_REPO_NAME="$3"
  85         [ -z "$VCSH_REPO_NAME" ] && VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
  86         export VCSH_REPO_NAME
  87         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
  88 elif [ "$1" = 'delete' ] ||
  89      [ "$1" = 'enter' ] ||
  90      [ "$1" = 'init' ] ||
  91      [ "$1" = 'run' ] ||
  92      [ "$1" = 'seed-gitignore' ] ||
  93      [ "$1" = 'setup' ]; then
  94         [ -z $2 ] && fatal "$1: please specify repository to work on" 1
  95         export VCSH_COMMAND="$1"
  96         export VCSH_REPO_NAME="$2"
  97         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
  98         shift 2
  99         export VCSH_EXTERNAL_COMMAND="$*"
 100         if [ "$VCSH_COMMAND" = 'run' ]; then
 101                 [ -z "$VCSH_EXTERNAL_COMMAND" ] && fatal "$1 $2: please specify a command" 1
 102         fi
 103 elif [ "$1" = 'help' ] ||
 104      [ "$1" = 'list' ]; then
 105         export VCSH_COMMAND="$1"
 106 else
 107         [ -z $1 ] && help && exit 0
 108         export VCSH_COMMAND='run'
 109         export VCSH_REPO_NAME="$1"
 110         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 111         [ -d $GIT_DIR ] || { help; exit 1; }
 112         shift 1
 113         export VCSH_EXTERNAL_COMMAND="git $*"
 114 fi
 115
 116
 117 for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
 118 do
 119         if [ ! -d "$check_directory" ]; then
 120                 if [ -e "$check_directory" ]; then
 121                         fatal "$check_directory exists but is not a directory" 13
 122                 else
 123                         echo "$SELF: info: attempting to create $check_directory"
 124                         mkdir -p "$check_directory" || fatal "could not create $check_directory" 50
 125                 fi
 126         fi
 127 done
 128
 129
 130 if [ "$VCSH_COMMAND" = 'clone' ]; then
 131         verbose "clone begin"
 132         init
 133         git remote add origin "$GIT_REMOTE"
 134         git config branch.master.remote origin
 135         git config branch.master.merge  refs/heads/master
 136         git fetch
 137         for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
 138                 [ -e "$object" ] &&
 139                         error "$object exists." &&
 140                         VCSH_CONFLICT=1;
 141         done
 142         [ "$VCSH_CONFLICT" = '1' ] &&
 143                 fatal "will stop after fetching and not try to merge!
 144   Once this situation has been resolved, run 'vcsh run <foo> git pull' to finish cloning.\n" 17
 145         git merge origin/master
 146         verbose "clone end"
 147
 148 #elif [ "$VCSH_COMMAND" = 'help' ] || [ "$#" -eq 0 ]; then
 149 elif [ "$VCSH_COMMAND" = 'help' ]; then
 150         help
 151
 152 elif [ "$VCSH_COMMAND" = 'delete' ]; then
 153         verbose "delete begin"
 154         old_dir="$PWD"
 155         cd "$HOME"
 156         use || exit $?
 157         echo "$SELF: info: This operation WILL DETROY DATA!"
 158         files=$(git ls-files)
 159         echo "These files will be deleted:
 160
 161 $files
 162
 163 AGAIN, THIS WILL DELETE YOUR DATA!
 164 To continue, type \"Yes, do as I say\""
 165         read answer
 166         [ "x$answer" = "xYes, do as I say" ] || exit 16
 167         for file in $files; do
 168                 rm -f $file || echo "$SELF: info: could not delete '$file', continuing with deletion"
 169         done
 170         rm -rf "$GIT_DIR" || echo "$SELF: info: could not delete '$GIT_DIR'"
 171         cd "$old_dir"
 172         verbose "delete end"
 173
 174 elif [ "$VCSH_COMMAND" = 'enter' ]; then
 175         verbose "enter begin"
 176         use || exit $?
 177         $SHELL
 178         verbose "enter end"
 179
 180 elif [ "$VCSH_COMMAND" = 'init' ]; then
 181         verbose "init begin"
 182         init
 183         verbose "init end"
 184
 185 elif [ "$VCSH_COMMAND" = 'list' ]; then
 186         verbose "list begin"
 187         for i in "$VCSH_BASE"/*.git; do
 188                 echo $(basename "$i" .git)
 189         done
 190         verbose "list end"
 191
 192 elif [ "$VCSH_COMMAND" = 'run' ]; then
 193         verbose "run begin"
 194         use || exit $?
 195         $VCSH_EXTERNAL_COMMAND
 196         verbose "run end"
 197
 198 elif [ "$VCSH_COMMAND" = 'seed-gitignore' ]; then
 199         verbose "seed-gitignore begin"
 200         use || exit $?
 201         # Switching directory as this has to be executed from $HOME to be of any use.
 202         # Going back into old directory at the end in case `vcsh use` is reactivated.
 203         old_dir="$PWD"
 204         cd "$HOME"
 205         gitignores=$(for file in $(git ls-files); do
 206                 while true; do
 207                         echo $file; new="${file%/*}"
 208                         [ "$file" = "$new" ] && break
 209                         file="$new"
 210                 done;
 211         done | sort -u)
 212         tempfile=$(mktemp) || fatal "could not create tempfile" 51
 213         echo '*' > "$tempfile"
 214         for gitignore in $gitignores; do
 215                 echo "$gitignore" | sed 's/^/!/' >> "$tempfile"
 216                 [ -d "$gitignore" ] && echo "$gitignore/*" | sed 's/^/!/'>> "$tempfile"
 217         done
 218         diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null &&
 219                 rm -f "$tempfile" &&
 220                 exit
 221         if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
 222                 echo "$SELF: info: $HOME/.gitignore.d/$VCSH_REPO_NAME differs from new data, moving it to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak"
 223                 mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
 224                         fatal "could not move $HOME/.gitignore.d/$VCSH_REPO_NAME to $HOME/.gitignore.d/$VCSH_REPO_NAME.bak" 53
 225         fi
 226         mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
 227                 fatal "could not move $tempfile to $HOME/.gitignore.d/$VCSH_REPO_NAME" 53
 228         cd "$old_dir"
 229         verbose "seed-gitignore end"
 230
 231 elif [ "$VCSH_COMMAND" = 'setup' ]; then
 232         verbose "seed-gitignore begin"
 233         use   || exit $?
 234         setup || exit $?
 235         verbose "seed-gitignore end"
 236
 237 else
 238         verbose "defaulting to calling help()"
 239         help
 240         fatal "You should never reach this code. File a bug, please." 99
 241
 242 fi